______ at the door before you enter my room, please.
| A．Knock | B．Knocking | C．Knocked | D．To knock |
We’ll ____ three groups to carry out the experiment in chemistry．
| A．be separated from | B．be divided into |
| C．be divided from | D．be separated off |
He fell from the bike and broke his leg．____, he will have to be away from school for two or three months．
| A．As a result of | B．With the result that |
| C．As a result | D．Without result |
When the plane ____, all the passengers on board should turn off their mobile phones.
| A．takes in | B．takes out |
| C．takes off | D．takes up |
--- Do you regret paying ten dollars for the book?
---No．I would rather pay ___ that price.
| A．three times so high as | B．so three times high as |
| C．as much three high as | D．three times as high as |
--- The film will begin at seven o’clock．We’ll meet at half past six．Is that OK?
---_____．I’ll pick you up at half past six in your home.
| A．It’s up to you． | B．That’s settled． |
| C．Not at all． | D．Oh, I see |